C + + Fifth experiment report

#include <iostream>#include<vector>#include<string>using namespacestd;//function DeclarationvoidOUTPUT1 (vector<string> &);voidOutput2 (vector<string> &);intmain () {vector<string>likes, dislikes;//create vector<string> objects likes and dislikesLikes = {"favorite book, music, film, Paintings,anime,sport,sportsman,etc" }; cout<<"-----I like these-----"<<Endl;    OUTPUT1 (likes); Dislikes= {"running, studying, etc" }; cout<<"-----I Dislike these-----"<<Endl;    OUTPUT1 (dislikes);    Swap (likes, dislikes); cout<<"-----I likes these-----"<<Endl;    Output2 (likes); cout<<"-----I Dislikes these-----"<<Endl;    Output2 (dislikes); return 0;}//function Implementation//output The element value of the vector<string> array Object v with the following labelvoidOUTPUT1 (vector<string> &v) { for(inti =0; I!=v.size (); i++) cout<< V[i] <<Endl;}//function Implementation//output The element value of the vector<string> array Object v in an iteratorvoidOutput2 (vector<string> &v) {vector<string>::iterator ITR =V.begin ();  for(ITR; ITR! = V.end (); itr++) cout<< *itr <<Endl;}

Two. 1.

#include <iostream>usingnamespace  std; int Main () {    int *p;   The pointer is initialized    9;   Direct use of    cout << *p << Endl after initialization ;     return 0 ;}

should be changed to

#include <iostream>usingnamespace  std; int Main () {    int *p=newint(9);   pointer initialization    cout << *p << Endl;
    delete p;     return 0 ;}

2.

#include <iostream>using namespacestd;intfn1 () {int*p =New int(5);//request memory for pointer p, the function does not release the memory of the pointer p    return*p;//}intMain () {intA =fn1 (); cout<<"The value of a is:"<<A; return 0;}

#include <iostream>using namespacestd;intfn1 () {int*p =New int(5);//request memory for pointer pDelete p;//if it is released here, it will not be able to return the value pointed by the pointer P, the program run error    return*p;}intMain () {intA =fn1 (); cout<<"The value of a is:"<<A; return 0;}

It should therefore be replaced

#include <iostream>
using namespace Std;
int fn1 () {
int t = 5;
int *p = &t;
return *p;
}
int main () {
int A;
A=fn1 ();
cout << "The value of A is:" << A;
return 0;
}

Three.

Not completed, still in debugging

Four. Second midterm

#include <iostream>#include<string>using namespacestd;classUser { Public: User (stringNmstringPd="111111") {Name=nm; Password=PD; ID= CurrentID +1; CurrentID++;    }; User (User&u) {name=U.name; Password=U.password; ID=u.id; CurrentID++;    }; ~User () {}; voidPrintuser () {cout<<"Name:"<< name <<Endl; cout<<"Passward:"<<password<<Endl; cout<<"ID:"<<id <<Endl;    }; voidResetpassward () {intn =3; stringOldpassward;  while(n) {cout<<"Please enter the original password"<<Endl; CIN>>Oldpassward; if(Password.compare (oldpassward) = =0) {cout<<"Please enter a new password"<<Endl; CIN>>password;  Break; }            Elsecout<<"input Error,"; N--;    }    }; voidPrintcurrentid () {cout<< CurrentID <<Endl; cout<<"ID:"<<id <<Endl; cout<<"Name:"<< name <<Endl; cout<<"Passward:"<<password<<Endl; };Private:    stringname; stringpassword; intID; Static intCurrentID;};intUser::currentid =999;intMain () {User U1 ("Liurui","111111");    U1.printuser ();    U1.printcurrentid ();    U1.resetpassward (); return 0;}

The third question of the midterm

 #include <string  >using  namespace   STD;  class   book { public  : Book ( string  isbnx, string  titlex,float   Pricex);  void   print ();  private  :  string      title;     string   ISBN;  float   price;};  

#include"book.h"#include<iostream>using namespacestd; Book::book (stringISBNX,stringTitlex,floatPricex): ISBN (Isbnx), title (Titlex), Price (Pricex) {};voidBook ::p rint () {cout<<"ISBN:"&LT;&LT;ISBN <<Endl; cout<<"Title:"<< title<<Endl; cout<<"Price :"<< Price <<Endl;};

#include <iostream>#include"book.h"#include<vector>using namespacestd;intmain () {vector<Book>Books; stringISBN, title; intPrice ;  while(true) {cout<<"Enter title"<<Endl; CIN>>title; cout<<"Enter Number"<<Endl; CIN>>ISBN; cout<<"Enter Price"<<Endl; CIN>>Price ;        Book Book1 (ISBN, Title, price);        Books.push_back (BOOK1); cout<<"Enter C to continue, enter S stop"<<Endl; CharA; CIN>>A; if(A = ='s')             Break; Else;    };  for(inti =0; I < books.size (); i++) Books[i].print (); return 0;}

C + + Fifth experiment report